<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="test">
    <input type="text" v-model="searchName">
    <ul>
        <li v-for="(p,index) in filterPersons" :key="index">
            {{index}}- - - {{p.name}}- - -{{p.age}}
        </li>
        <button @click="setOrderType(1)">年龄升序</button>
        <button @click="setOrderType(2)">年龄降序</button>
        <button @click="setOrderType(0)">还原排序</button>
    </ul>
</div>
<script type="text/javascript" src="../js/vue.js"></script>
<script type="text/javascript">
    new Vue({
        el:'#test',
        data:{
            searchName:'',
            orderType: 0,   //0代表原本数据，1代表升序，2代表降序
            persons:[
                {name:'Tom',age:18},
                {name:'Jack',age:15},
                {name:'Bob',age:12},
                {name:'Rose',age:19},
            ],
        },
       computed:{
            filterPersons(){
                //取出相关的数据
                const {searchName,persons,orderType}= this
                //最终需要显示的数组
                let fPersons;
                //对persons进行过滤
                fPersons = persons.filter(p => p.name.indexOf(searchName)!==-1)

                //排序
                if(orderType!==0) {
                    fPersons.sort(function (p1, p2) {    //如果返回为负数，p1在前,返回正数，p2在前
                        //1代表升序，2代表降序
                        if(orderType===2) {
                            return p2.age-p1.age
                        }else {
                            return p1.age-p2.age
                        }
                    })
                }
                return fPersons
            }
       },

        methods:{
            setOrderType(orderType){
                this.orderType = orderType
            }
        }
    })
</script>
</body>
</html>